privately, u.s. officials are saying it would be complicated and military members are saying it would involve taking out anti-aircraft installations in libya which in other words, means bombing. on top of that, the u.s. would do that within the framework of nato, who would need the backing of the un and countries like russia and china, who are unlikely to back such a measure in the security council and have veto power, a no-fly zone seems to be rather unlikely. >> thank you for that. from washington. witnesses are reporting confrontations between security forces and protesters in tehran. fierce clashes occurred near tehran university. the police used tear gas to disperse the crowd. the demonstrators are protesting against the alleged imprisonment of two opposition leaders. their current whereabouts are not clear. and i government protests have increased across iran in the past few days. -- anti-government protests have increased across iran in the past few days. now the latest from the biggest techno